Method of preparing molds for electrotypes.



G. E. DUNTUN.

METHOD 0F PREPARING MoLDs POR BLEGTROTYPES.

APPLICATION FILED MAE 3, 19094 Patented Oct. 12, 1909.

3 SEEBTS-SHBBT 1.

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G. E. DUN TON METHOD 0F PRBPARING MOLDS POR ELECTROTYPES.

APPLICATION FILED EARL 1909.

Patented Oct. 12, 1909.

.w 2 n L a n a G. E. DUNTON.

METHOD 0F PREPARING MOLDS FOR ELECTROTYPBS.

ABPLIGATION FILED MAR. s. moa.

936,871. Patented 001;. 12, 1909.

3 SHEETS-SHEET 3,

UNITED STATES PATENT OFFICE.

enonon n. Dumon, or new some, N. Y.

METHOD or rnmranma nomia non mc'rnomns.

To all whom 'it may concern:

Be it known that I, GEORGE E. DUNTON, residing` at New York city, county of New York, btate of New York, a citizen of the United States, lun-'e invented certain new and useful Improvements in Methods of Preparing Molds for Electrotypes; and I do declare the follewin to be a full, clear, and exactl description o the invention, Such as will enable others skilled in the art to which it pertains to make and use the same.

l ly invention relates to an improved method of preparing molds for electrotypes, and more especially to a method of polishing and shaving or lening the surfaces of wax molds used by ellectrotypers in the molding ofIt-hleir orms. b h h l t as oritso 'ectt es m' or aning either by heated o]r unheated gans the Surface of the mold, which may be made of wax or other suitable material, and or burnslf said shaved surface, as it is shaved, wlth heated means which is separate from the shaving or planingmeans but designed to be used in connection therewith, thus combining the shaving or planing` and polishing in one operation and producing a mold with a perfectly smooth, level and even surface, free from its, indentures or other imperfections, and imparting tothe Surface of the wax a polished or burnished appear ance. l

It further has for its object toprqride means whereby the mold is held in place during the operation of sharing or planing and polishing its surface.

It still further has for its obect to provide a method for preparing molds for elecv trotypes which is simple and inex v isive and which accomplishes the. desir result perfectly.

The. method now universally used is as follows :-The wax case, which is a thin sheet of copper or electroty metal, having been filled is placed on a tA le having a rim alon its edges and melted wax or other snita )le composition having been poured over the surface of the case, it is allowed to cool, set and become hard and then subjected to the knife of a wax shaving machine. By this method all the molds are made to one standard thickness and are primarily given what has been desired to be a smooth surface, but after bein subjected to the scraping action of the nife due to its relative position to the bed of the machine and to the Specification o! Letten Patent.

Application tiled web 8, 1w- Berlal lo. 141t- Batented Oct. 12,1909.

i fact that it has not heen heated, the scraped surface of the wax will be rough and if the knife has been nicked or gapped alo its so called, cutting ed the surface wi 1 be streaked, each gap caving a. little ridge alo the surface o'f the wax in the direction in w ich the knife is carried or the mold travels. It is then generally necessary to again scra e these molds, especially if they are used or the molding of halftones or other fine cuts, by hand or to flame them by y ssi an open llame of gas over the sur ace o the wax. This latter method has a very decided disadvanta e in that it leaves the surface of the wax ful of minute pits, which become very pronounced when examined through the m 'fy' glass. Each of these pits fills Wit molllng lead more or less of which it will retain leaving minute rough spots over the surface of the electrotype plate later on. These methods of rescrapmg or flaming are not only unsatisfactory, but they are expensh'e as the o ration consumes considerable time to either flame or scrape each mold by hand.

By my method which in the main is to polish, bnrnish or iron out any imperfections or uneven places in the surface of the mold and give it a polish or gloss after it has been shaved or planed I em loy heated polishing means which althoum it is separate from the shaving or planing means is situated in proximity to the same.

Referring to the drawings r'hich lllustrate an a paratns for carrying out my method igure 1 is a side elevation. Fig. 2 a detail sectional view of the shaving or or ironing means arranged to be heatedby gas. Fig. 3 a top plan View of the polishing .linruishn r or ironlnv means. Fig. 4 a cross tion o the polishuig means as shown in 2 on an enlarged scale. Fig. 5 is a cletill; view of the perforated burner for use when the polishing means is to be heated by "s, 6 is a detail vieu' of a modified rm .nig polishin means adapted to be heated by steam. Pig. 'i' is a detail view of a modified form of polishing means adapted to be heated by electricit.

In the drawings in which like numerals of reference denote like parts throughout the several views, 1 re )resents the apparatus or machine bywhich l1 carry out my method, which comprises a framework 2 provided with n reciprocally movable bed or table 3 planing means and the polishing burnishingA lll) which is desi ed to carry a wax mold 4, said framewolr having a bridge piece 6 ex-4 tending across the same. To e bridge iece a, hollow heating chamber d is Secured y means of cap screws 7:, gas bemg fed to the same by means of a p1 8, from any desired source of supply, w ch when ignited heats said chamber, and 9 is a hood or shield which covers the gas flame and prevents it from beingnblown out. The heatf mg chamber 6 has a ife 10 secured on its under side by means of suitable screws 11 and heat is transmitted thereto from said hea chamber. Steam, electrieit or any other eat.- medium may be su tituted for the gas e for heatintE the chamber 6, which heats the knife, or e knife may be heated direct.

The front of the cutting edge 12 of the knife 10 is elevated or raised shghtly above itsrearedge13sothatthelmifehasa tendency to cut in a plane with its under surface, which is upward, which prevents the knife from scra ing or tplulling the surfaceofthewaxan causes erearedgeof the knife to be pressed u n thesurface of the wax mold 4.- and to ho d said mold down If the kmf' e dgs itchei downwauil'g to its cutting e e ten ency wo be to ull the wax mold up on to the knife nstrla oflshavingboi s\ n'face.` f

e lshing, urm mg or iron r o the su ce of t e mold is accomplishud by means of a plate or bar 14 adjustably connected, at each end, to brackets 15 extending upwardl 'om the framework 2, said late or bnr ing heated by means of a perC orated s burner 16 .which directs the llame against the upper surface of the same. 17 being a pi or feeding gas to said burner. The hing means shown in F' 6 compris afhllow roller 18 provided wi a steam inlet pipe at one end and a steam outlet at the other end, while the polmeans shown in Fig. 7 comprises an tneally heated chamber 19. The heated means is shown in t-he form of a late or a chamber and a roller or c liner but any other device which is capab e ofr being heated and which will polish or burnish can .be used. The heated polish' means may either be permanentlgv securedf the :(.pratus or machine an the mella mov ck and forth under the same, by mechanical means or by hand, or the I"mold ce ofthe may be stationary and the polshin means moved over the mold by mechanica means or by hand..

The operation is as follows The knife 10 shaves 0E a portion of the wax mold in the form of a shaving and ns the mold passes under the pohsher or burnisher 14 polishes or burnlshes, smooths or irons the surface of the wax mold b slightly softening the surface and smoot it down'. The bed or table 3 reclprocates on the framework under the knife and polisher and when one mold is .finished and removed the bed is returned to its first position ready for other molds.

What I claim isz- 1. The method of preparing molds for electrotypeseonsistng in formm the mold and allowing it to cool, shaving t e surface of the mold and then polishing the surface of .said-mold with heated pollshing means which is separate from the shaving means. substantially as described.

2. The method of preparing molds for electrotypes conslsting in formlng the mold and allowiu it to cool, shaving the surface of the mol with heated means and then polishing the. surface of said mold with eated pollsbm means which is separate from the hea-te shaving means, substantally as described.

3. The method of preparing molds for electrotypes consisting 1n simultaneously shaving and polishing the surface of the mold, the polishing means being heated and separate from the shaving means, substantially as described.

4. The method: of preparing molds for electrotypes consisting in forming the mold and allowinur it to coo simultaneously shinv` ing and polishing the surface of the mold with heated means, the heated polishing means being separate from the heated shaving means, substantially as described.

5. The method of preparing molds for electroty consisting in shaving the surface of t e mold and then lishing it with heated polishing means w ich is separate oiethe shaving means, substantially as descm In testimony whereof aix my signature 105 

